Our heritage sash windows are made to match box sash windows crafted more than a century ago. These premium sash windows, with the classic weight-and-pulley mechanism, are the perfect choice for replacement windows in listing buildings, while also suiting high-end architect-led new developments.

We use traditional putty externally to secure high-performance Slimlite glass. Single or double glazed, this authentic-looking slim glass satisfies the modern demands for acoustic and thermal performance.

Solid glazing bars come as standard, so each window comprises a number of individual glass panels, giving these heritage sash windows genuine character.

For non-listed buildings, you may also wish to browse our collection of traditional timber windows and doors.


Product guidance - As Standard
Frame 100 x 140 mm (lining width x frame depth), manufactured using mortise and tenon joints, glued and mechanically fixed
Sash 39 x 45 mm top rail and stiles, 90 x 55 mm bottom rail, 45 x 55 mm meeting rail
Mullion / transom 200 mm wide (130 mm for triple sash with fixed outer sash)
Sill projection 35 mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm
Staff / parting beads Timber
Wood moisture content 12-19%
Glazing beads External Traditional putty glazed
Product specification
Material Frame+Sashes Engineered redwood, Bottom Cill in Solid Hardwood - Standard. Engineered hardwood, Accoya, European oak.
Finish Three coat spray applied factory finish using water based micro-porous paint / stain.
Colour White - RAL 9016 - Standard. Any RAL - from RAL classic range. Stain - from TRC stain range.
Glazing Double slimlight glazed, 4/6/4 Low-E top sash – 4toughened/6/4 toughened bottom sash – Standard. Single Glazing of 4 mm or 6mm thick toughened - Optional.
Perimeter spacer bars White perimeter spacer - Standard. Black spacer optional.
Solid Bar Ovolo 24 x 45mm.
Trickle ventilation Concealed through frame head trickle ventilator. EA 1700, 4400, 5000 mm²
Child restrictor Angel lock standard. Traditional Sash Stop optional.
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Heritage Sash Windows
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